Electrically heated soldering iron



July 7, 1931.. c. HELLE 1,813,161

ELEGTHICALLY HEATED SOLDERING IRON Filed Oct. 3. 1929 Inv@ 17 CCLTZ E,

Patented July 7, 1931 UNITED STATES PATENT OFFICE CARL- HELLE, F BRUNSWICK, GERMANY, ASSIGNOB T0 ELEKTRISCHE LT-UND SCHWEISS-GESELLSCHAFT BESCHRANXTEB EAFTUNG, 'OF BRUNSWICK, GEB- MANY ELECTRICALLY HEATED SOLDEING' yIRON' Application led October 3, 1929, Serial No.

My invention relates to improvements in electrically heated soldering irons, andthe object of the improvements is to provide a soldering iron which is not subject to destruction by overheating, and with this object in View my invention consists in constructing the soldering block from a material such for example as chromium-nickel steel having a suiiicient resistance to electric current that it can be used as resistance material for transforming the energy of the electric current into heat.

For the purpose of explaining the invention an example embodying the same has been shown in the accompanying drawings in which the same reference characters have been used in all the views to indicate correspending partsLmIn said drawings,

Fig. 1 is an elevation partly in section showing the soldering iron, and

Fig. 2 is a sectional plan view taken on the line 2 2 of Fi 1.

In the example sown in the drawings the soldering iron comprises a handle a and an 391,044, ana in Germany umh 1s, '1929.

arm Z1 embedded in the said handle and having laterally directed shanks g having angularA pieces h secured thereto to provide chambers for reeeivin the soldering block d. Preferably, the sald soldering block is bent I outwardly into V-shape, and it is lfixed with its ends within the said housings by means of screws z', sheets c ofy insulating material such as asbestos being preferably inter osed between the walls of the housings an the side walls of the block d. To the ends of the block d leads e and are electrically conv nected, which are prearabl passed throughV a longitudinal bore of the andle a.

By constructing the block d of resistance material such as chromium-nickel'steel the current passed therethrough is transformed into heat. Even when heating the block d for a longtime without using the same the said material is not alected injuriously.

`The soldering iron may also be vused in soldering machines and the like. I claim:`

The hereindescribed soldering apparatus, comprising a supporting member having a pair of spacedA laterally directed shanks for .asl 

